I'm sure they'll be happy to provide for whatever their guests desire. And as soon as a guest asks for a prostitute of the same sex, he or she will have it. I'll bet it hasn't happened yet, though. Westworld's clients are rare, and gay folk who like prostitutes are rare among the rare. For some reason, some people think there's something wrong with a show that doesn't highlight the infinitesmal.
RE: Behold, the Biggest TV Show of the Year! It's a Brave New A.I World